Rifle upper receiver



FIG. 1 is left front upper perspective view of a rifle upper receiver showing my new design with a stock, grip, magazine, and barrel attached thereto;

FIG. 2 is a left front upper perspective view thereof;

FIG. 3 is a right front upper perspective view thereof;

FIG. 4 is a left rear lower perspective view thereof;

FIG. 5 is a right rear lower perspective view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof;

FIG. 8 is a left side view thereof;

FIG. 9 is a right side view thereof;

FIG. 10 is a front view thereof; and,

FIG. 11 is a rear view thereof.

The broken lines form no part of the claimed design. 

CLAIM The ornamental design for a rifle upper receiver, as shown and described. 